Pipe-coupling.



PATENTED MAR. 7, 1905.

J. MCDONALD.

PIPE COUPLING.

APPLICATION FILED SEPT. 24. 1904.

UNITED STATES Patented March 7, 1905.

ATENT FFICE.

JOHN i\lCl)ONALD, OF BRADFORD, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO H. HARRINGTON, OF BRADFORD, PENNSYLVANTA.

PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 784,416, dated March 7, 1905.

Application filed September 24,1904. Serial No. 225,807.

To all whom it may concern:

Be it known that I, J OHN MCDONALD, a citizen of the United States, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented new and useful Improvements in Pipe-Couplings, of which the following is a specification.

This invention relates to pipe joints or couplings.

In practice it is found that after pipe-couplings such as are used upon gas-mains and the like have been installed for several years they become worn, loose, or rusted in such manner as to permit leakage. In order to prevent this leakage, it is necessary generally to renew the coupling. This operation is doubly expensive on account of the cost of the couplings themselves and of the labor and time which is necessary to effect their renewal.

The principal object of this invention is to avoid the necessity of replacing the coupling after it has been in use for an extended period of time.

Further objects of the invention are to improve, simplify, and strengthen the construction of pipe-couplings; furthermore, to decrease the expense attending their manufacture 'ith the foregoing and other minor objects in view, which will appear as the description proceeds, the invention consists in a pipecoupling provided with structural features which adaptit to be effectually soldered after it has been in use for a period of time and shows signs of leakage.

The invention also resides in the particular combination and arrangement of parts and in the precise details of construction hereinafter described and claimed as a practical embodiment thereof.

in the accompanying drawings, forming part of this speciliction, Figure 1 is a longitudinal central section, partly in elevation, of a pi pe-cou plingconstr ucted in accordance with the invention. Fig. 2 is an end view of one of the collars. Fig. 3 is a similar view of one of the rings. Fig. 1 is a similar view of one end of the sleeve.

Like referencenumerals indicate corresponding parts in the different views.

The reference-numerals l and 2 indicate pipe-sections which are adapted to be joined together by means of the improved coupling which constitutes the subjectanatter of this invention. The pipe-sections 1 and 2 are litted into the opposite ends of asleeve 3, which is formed with flaring ends 4 and with an interiorly-disposed annular shoulder 5, against which the pipe-sections abut. The sleeve 3 is also formed with a portion 6, having a plurality of flattened faces to receive a wrench. Each of the flared ends 4 of the sleeve 3 is formed with a threaded portion 7, an annular groove 8, and a plurality of longitudinal grooves 12, which extend through the screwthreads 7 and annular groove 8.

' Surrounding each of the pipe-sections 1 and 2 and located in one of the flaring ends 4: is a packing-ring 9, which is constructed, preferably, of rubber or other compressible material suitable for the purpose. The packingring 9 is held in position by means of a metallic ring 10, having on the periphery thereof a plurality of cars or lugs 11, which are adapted to fit into the longitudinal grooves 12 in the flared ends of the sleeve 3. The ears or lugs 11 serve to prevent the metallic ring 10 from rotating, and thus tearing or abrading the packing-ring 9. In addition to the ears or lugs 11 the metallic ring 10 is formed with an annular rib 13, which is designed to bite into the packing-ring 9 and cause the expansion thereof against the pipe-coupling, thus preventing any leakage of the joint. The metallic ring .10 is forced against the packing-ring 9 by means of a collar 14, which is formed with suitable screw-threads to engage the threads of the sleeve 3. As shown in Fig. 1, the collar 1 T is concentrically removed from the pipe-section, as indicated at 15, and is formed at its outer end with an annular cutaway portion 16, which constitutes a flaring entrance to the annular chamber between the collar 14 and the pipe-section. After the pipe-coupling has been used for a year or two solder or suit-able calk material maybe placed vthreads or the like.

in the annular chamber between the collar 14 and the pipe-section in order effectively to prevent any leakage of the coupling. Furthermore, the annular groove 8 in each of the flared ends of the sleeve may be soldered or calked for the same purpose.

In order to reduce friction between the metallic ring 10 and the collar 14:, said collar is formed upon the end thereof which abuts against the ring 10 with a plurality of knobs or projections 17. The collar 14 is also formed on its outer surface with a plurality of ribs or projections 18 to provide gripping members for a wrench While placing the coupling in position.

The sleeve 3 adjacent to the end of the pipesections 1 and 2 is formed with an annular chamber 19 upon each side of the annular shoulder 5. The annular chambers 19 permit slight movement of the pipe-sections 1 and 2 with respect to each other, whereby an absolutely-rigid coupling is avoided, for which reason, in the event that any bending strain should fall upon the joint, no fracture thereof will result.

The improved coupling of this invention is strong, simple, durable, and inexpensive in construction, as Well as thoroughly efficient in use. It is adapted to maintain the ends of a plurality of pipe-sections in cooperative relation with each other Without the necessity of forming said pipe-sections with screw- Furthermore, in the event that the coupling shows leakage after several years of use it can be calked or soldered without the necessity of installing an entirely new coupling.

Having thus described the invention, what is claimed is- 1. The combination with a plurality of pipesections, of a sleeve having screw-threaded ends. each of said ends being formed with an annular groove and a plurality of longitudinal groove-s, a packing-ring fitted into each of said ends and surrounding one of said pipe sections, a metallic ring abutting against each of said packing-rings, and having a plurality of cars or lugs fitting into the longitudinal grooves of the sleeve, each of said metallic rings having an annular rib thereon adapted to bite into the adjacent packing-ring, and a collar screwed into each end of said. sleeve, each of said collars being concentrically removed from the adjacent pipe-section and having a plurality of knobs or projections abutting against the adjaccnt metallic ring.

2. The combination with a plurality of pipeseetions, of a sleeve having its opposite ends formed interiorly with longitudinal grooves, a packing-ring disposed in each end of said sleeve, a metallic ring. in each end of said sleeve having ears or lugs fitting into the adjacent longitudinal grooves, and means for retaining each of the metallic rings in position.

The combination with a plurality of pipesections, of a sleeve having flared screwthreaded ends, each of said ends being formed with a plurality of longitudinal grooves and an annular groove, a packing-ring fitted into each of said flared ends, a metallic ring fitted into each of said flared ends and having ears JOHN NTODONALD. \Vitnesscs:

A. F. MOORE, J. P. GREENWOOD. 

